Automatic engaging and disengaging device for dynamo and storage batteries.



PATENTEDJAN. 8, 1907 0. BOHM. I ENGAGING AND DISENGAGING DEVICE FORDYNAMOS AUTOMATIC AND STORAGE BATTERIES. APPLIOATION FILED SEPT.14,1906.

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w/ TA/ESSES 624mm w No. 840,685. PATENTE'D JAN. 8, 1907. O. BOHM.

AUTOMATIC ENGAGING AND DISENGAGING DEVICE-FOR DYNAMOS AND STORAGEBATTERIES.

APPLICATION FILED SEPT.14',1906.

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r/wsssEs OTTO BOHM, (9F B PATENT UFFEQE.

ERLTN, GERMANY.

AUTOMATIC ENGAGING AND DISENGAGlNG DEVICE FOR DYNAMO AND STORAGEBATTERIES.

Specification of Letters Patent.

Patented Jan. 8, 1907.

Application filed September 14, 1906. Serial No. 334,694.

To all ZUI'LO'II'D it may concern:

Be it known that I, Or'ro Bonn, a citizen of the Empire of Germ any,residing at Berlin, in the Empire of Germany, have invented a new anduseful Automatic Engaging and Disengaging Device for Dynamo and StorageBatteries, of which the following is a specification.

My invention relates to a device for automatically engaging anddisengaging a friction-gear which controls a shaft for driving a dynamothat cooperates with a storage battery.

The urpose of my invention is to automatically stop the dynamo on thetension of the current exceeding a certain maximum and to automaticallystart the dynamo 'on the tension of the ciuent sinking below a certainminimum.

The new engagin and disengaging device is particularly suitable forvehicles or cars in which a dynamo to be driven from the wheels and astorage battery are disposed for furnishing the curent which is requiredfor feeding various lamps in the vehicle or car.

I will now proceed to describe my invention with reference to theaccompanying drawings, in which it is assumed that the dynamo is to bedriven from the wheels of a vehicle or car for feeding, in conjunctionwith a storagebattery, the lamps of the vehicle or car.

Figure 1 is a vertical longitudinal section throu h a frame part of thevehicle or car provided with the automatic engaging and disengagingdevice on the broken line 1 1 in Fig. 2, the two friction-wheels and thedynamo being shown in elevation. Fig. 2 is a plan view of the same. Fig.3 is a vertical cross-section through the broken line 3 3 in Fig. 2 andFig. 4 is a diagram of the two driving friction wheels, the dynamo, thestorage battery, the automatic engaging and disengaging device, and thecircuit.

Similar letters of reference refer to similar parts throughout theseveral views.

(1 denotes a wheel-shaft of the vehicle or car, which is in any known orspecial manner mounted to turn in journals (not shown) disposed on theframe. Of this frame only parts of two. longitudinal beams g g and across-beam g, are shown. On the shaft care fastened the two wheels 0 0,running on the rails t; and also a driving friction-wheel d. The dynamoc of any known construction is suspended from the cross-beams g and g bymeans of suitable strips f f or the like. Oppbsite to the friction-wheeld an electromagnet h of the following construction is disposed on thecross-beam 9 It comprises a metallic cylindrical casing h, a movableiron core 72/ and a coil 72 The core 72,, is shown as made in one piecewith a piston 71 which is mounted in the casing h, to reciprocate withinthe space not occupied by the coil 71 It will be seen that the piston/L4 and the casing h serve as an air-brake, which prevents the core bfrom moving too rapidly and suddenly. In line with the core'h and alsowith the dynamo 6 the second friction-wheel i, of any knownconstruction, is disposed and arranged to move as follows: It isfastened on short shaft i,, the two ends of which are mounted to turn insuitable ball-bcarings al provided in the eyes of a yoke formed by twoarms is, and A cross-rod m is shown as fastened with its one end on thelongitudinal beam 9 (see Fig. 2) by means of a bolt or the like. It isbent and passes through a block which is secured on the longitudinalbeam 9 by means of a doubled bolt m (See Fig. 1.) At the other end ofthe rod m a loose collar m is fastened by means of a pin m, or the like.Between this collar m and the said block the naves 7c, and 76 of thesaid two arms 761 and 7c, are mounted to rock on the rod m, while theyare rigidly connected one with another by means of bolts Ic as is shownin Fig. 2. .The eyes of the two armslr and 7c, are provided with ears,between which a cross-head k is secured by means of two bolts la, and kThe cross-head k is connected with the core 7L2 by means of a chain 7L5,while a helical spring h is inserted between the cross-head h and thecasing h its two ends engaging in suitable annular recesses.

The short shaft i, of the friction-wheel i is in any known manneryieldingly connected with the armature-shaft c of the dynamo c,preferably by means of an intermediate shaft t and elastic couplings.The shaft 12. may be provided at its two ends with disks which. arecoupled with corresponding disks of the two shafts i and c, by means ofinserted leather disks it, and a, and pins alternately engaging fromboth sides in suitable holes, as is shown. The helical spring 71,, isgiven such :1 tension as to press the small friction-wheel i against thelarge friction-wheel d and To produce between them a friction sulli ientfor driving the dynamo e. The coil a on the contrary, is so proportionedas to be able to attract the connected with the one a of the relay 1".

relay Q will remain inactive, although the curof the chain h ,w

core 7L3, and thereby to detach the driven friction-wheel i from thedriving friction-wheel d, while overcoming the tension of the helicalspring h the moment the tension of the our- 5 rept in the coil h gexceeds a certain maximum.

A storage battery 0 (see vFig. 4) of any known and approved constructionis disposed on thevelncle or car and may, for example, serve for feedinga circuit 1), comprising a I 10 plurality of incandescent lamps.Moreover,

on the vehicle 07: car two relays g and 1* are disposed, thearmatures gand r, of which are normally pressed on rear contacts by means ofspring; and 1;, respectively, as is '15 shown. The coil IQ, of theelectromagnet h is connected, on 6160118 hand, direct with the one poleof the storage battery '0 and, on the otherhand, with the front contactg, of the relay g. The one pole of the dynamo e is pole of the storagebattery '0 and also with the one end of the one I coil 7-, of the relay7. The other pole of the dynamo e is connected with the other end of thecoil 1, and "also with the front contact r The armature r of this relayis connected over the second coil 1", with the other pole of the storagebattery 0. The coil of the relay 9 is shunted to the storage battery 0in the manner shown.

IIf the vehicle or car stops, of'course the dynamo e willbe idle, sothat the storage batthe tension of the current circulating'in thesaidcircuit attaining acertain amount the relay 1" Wlll be so much energizedas to attract its armature r wlnle overcoming-the tension 5 of thespring T The armature r will then come in-contact'with the front contactr so that the dynamo'e willnow be connected in multiple with the storagebattery ofor supplying current to the circuit 1) or for charging thebattery, as'the case may be. -The-other rent at the'same'time passesthroughits-coil. If, however, the tension of the dynamo e,-andth'ereby,-also, the potential difference at both 5 5 poles of thestorage battery 0, exceeds a-de-' terniined maximum, the relay q will beenabled toattract its-arm i'ture g while over coming the tension of thespring 9 so that the armature g, will comcin contact with-the 60 frontcontact g and will. close the circuit of the electromagnet 'h. Thelatter'will therefore be energized for attracting its core k and thusdetaching the driven friction-wheel i from the drivinglfiiction-wheeldby means 'le overcoming the tension The plant described operates asfollows:v

of the helical spring h Then the dynamo e will stop, and the storagebattery 0 alone will continue supplying the current to the circuit p.Should the tension of the circulatingcurrent sink below a determinedminimum, the spring g will overbalance the force of the coil of therelay g and will detach the armature from the front contact for openingthe circuit of the electromagnet h. Then the helical spring h will pressthe driven frictionwheel i against the driving friction-wheel d, and thedynamo c will restart and work. Should the tension of the dynamo a sinkbelow that of the storage battery 0, the relay 1* will release itsarmature r under the action of the spring T and thus disconnect thedynamo e from the storage battery 0. Thereby the storage battery 0 willbe prevented from discharging over the dynamo e.

The automatic engaging and disengaging device described above may bevaried in many respects without departing from the spirit of myinvention. Where so preferred, the shaft of the driven friction-wheel imay be mounted to turn in slides moving in straight guides instead of intherocking yoke, as described above.

1. In an arrangement of the class described, the combination with adriving friction-wheel having its shaft mounted to turn in fixedjournals,of a friction-wheel adaptiid to work with saiddriving frictionwheel and having-its shaft mounted to turn in movable bearings, adynamo, a yielding coupling between the shaft of said fi'iction-Wheeland that of said-dynamo, a spring adapted'to press said friction-wheelby means of its bearings against said driving'friction-Wheel,

and an electromagnetic deviceadapted todetach said friction-Wheel bymeans of its 'I'hovable bearings from saiddri'ving frictionwheel. q

2. In an arrangement of the class described, the combination with adrivingfrictio'n-wheel having its shaftmounted toturn in fixed journals,of a friction-wheeladapted to work with said driving friction wheel andhaving its-shaft mounted to'turnin movable bearings, a dynamo, ayielding-coupling between-the shaft of said friction-wheel and that ofsaiddynamo, a-spring' adapted to ress said friction-wheel by means of'-its hearings against said driving friction-wheel, an electromagneticdevice adapted to de ach saidfrictiomwheel by means of its bearings fromsaid driving friction-wheel, a storage battery, a working-circuitconnected in multiple with said storage battery and saiddynamo, ashunt-circuitconnecting said electromagnetic' device withsaid-storage'battery,

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and 'a relay shunted to said stcrage 'battery I and adapted to closesaid "shunt-circuit on the tension of the current exceeding "a-de-.termined'maximum. r30

in arrangement of the class described, the combination with adri -Iingfriction-Wheel having its shaft mounted to turn in fixed journals, of africtiomwheel adapted to Work with said driving friction-Wheel andhaving its shaft mounted to turnin movable bearings, a dynamo, ayielding coupling between the shaft of said friction-wheel and that ofsaid dynamo, a spring adapted to ress said hi tion-Wheel Icy means ofits driving friction-Wheel,

.carings against electromagnetic device adapted to detach iction rheelby means of its bearings from said. ingfriction-Wheel, storage battery,r or ring circa. it connected in multiple with said storage and said dyemo, shunt-sir tut connecting said electromagnetic device storagebattery, a relay shunted to said storage battery and adapted to. closesaid shunt-circuit on the tension of the current exceeding a deterrinedmaximum, and a second relay adapted to disconnect said dynamo ii? iiistorage battery on tension of the current sinking below a de terminedminimum.

L in an arrangement of the class described, the combination with adriving friction-wheel having its shaft, mounted to turn in fixedjournals, of a shaft mounted in movable hearings to turn, afriction-whecl fastened on said shaft and adapted to Work with" saiddriving frictioncvheel, a dynamo With a rotor-shaft, an intermediateshaft, yielding couplings connecting said intermediate shaft with saidshaft and the rotor-shaft of said dynamo, a spring adapted to press saidfriction-Wheel by means of said shaft and its bearings against saiddriving friction-Wheel, an electromagnetic device adapted to detach saidfriction-Wheel by means of said shaft and nee-rings -from said drivingriction-Wheel, a storage battery, it working circuit connected inmultiple with said storage battery and said. dynamo, a. shunt-circuitvconnecting said electromagnetic device with said storage battery, arelay shunted to said storage batteryand adapted to close saidshunt-circuit on the tension of the current exceeding a determinedmaximum, and a second relay adapted to disconnect said dynamo from saidstorage battery on the tension of the current sinking below a deter nedmirnmum.

in an arrangement of the class ecombination ith a driving fric-- tmounted to turn ing yoke, a friction-Wheel fastened on said shaft andadapted to Work with said driving friction-wheel, a dynamo With arotor-shaft, an. intermediate shaft, yielding cou lings connecting saidintermediate shaft with said shaft and the rotor-shaft of said dynamo, aspring adapted to press said friction-Wheel by means of said rockingyoke against said drivingfriction-Wheel, an electromagnetic deviceadapted to detach said friction-wheel by means of said rocking yoke fromsaid driving friction-Wheel, a storage battery, a Working circuitconnected in multiple With said storage battery and said dynamo, ashunt-circuit connecting said electromagnetic device with said storagebattery, a relay shunted to said storage battery and adapted to closesaid shunt-circuit on the tension of the current exceeding a determinedmaximum, and a second re ay adapted to disconnect said dynamo from saidstorage battery on the tension of the current'sinking below a determinedmimmum. r

6, in an arrangement of the class described, the combination with adriving friction-Wheel having itsshaft mounted to turn in fixedjournals, of a rocking yoke, a shaft mounted to turn in the free end ofsaid rocking yoke, a friction-Wheel fastened on said friction-Wheel, adynamo with a' rotor-shaft, an intermediate shaft, yielding cou 8connecting said intermediate shaft wit said shaft and the rotor-shaftofsai dynamo, an electromagnetic device, a helical spring between saidrocking yoke and said electromagnetic device and ada ted to press saidfriction-wheel against sai driving friction-Wheel, a chain connectingsaid yoke with said elec shaft and adapted to Work with said driving atromagnetic device and adapted on the latter being energized to detachsaid friction-Wheel from said driving filOl'JiOI1Wl1(-36l,'& storagebattery, a Working circuit connected in multiple with said storagebattery and said dynamo, a shunt-circuit connecting said electromagneticdevice with said storage battery, a relay shunted to said storagebattery and adapted to close said shunt-circuit on the tension of thecurrent exceeding a determined maximum, and'a second relay adapted todisconnect said dynamo from said storage battery on the tension of thecurrent sinking below a determined-minimum. OTTO BOHM.

Witnesses 2 Eisner HAsPER, WoLnnMAs HAUrr.

